I think gp meant the big 4 state owned commerical banks: people's bank of china (pboc), construction, industrial + commerce, and agricultural
[1] http://en.wikipedia.org/wiki/Banking_in_the_Peoples_Republic...
[1] http://en.wikipedia.org/wiki/Banking_in_the_Peoples_Republic...
What? Where? The only mention of "big four" in his text is about big audit firms being silent about evidence of fraud perpetrated by big Chinese companies.